This doesn’t happen until I’ve been driving it for a while (over an hour). I’ll just be driving along and all of a sudden the steering wheel will give a bumpy jerk to the left. When it happens I feel like the front passenger tire is flapping or something. Then it stops for a few minutes and it happens again. The longer I drive it the more violent the episodes get. At first it’s not bad but it will continue to get worse to the point where it is undriveable. But if I am going on short trips its just fine. Does anyone know what’s wrong with my car? It has 103,000 miles on it. Thanks!

You might have the steering rack closely inspected and that means the inner and outer tie rods/tie rod ends which are part of it.

Assuming the inner and outer tie rods/ends are fine there could be an internal issue with the steering rack. I’ve run across this on a few cars although never on a Nissan.

One of them was a very odd case. It was a Chevrolet that ran and drove like a dream. However, when even one front tire hit a damp spot (NOT a puddle and as small as say 12" in diameter) on the roadway that car would get squirrelly and go all over the lane of traffic.
It was the steering rack that was the cause of this.